Port leftovers: BringWindowToDisplayBehind, ImGuiSizeCallbackData + CalcWindowSizeAfterConstraint, ErrorCheckUsingSetCursorPosToExtendParentBoundaries, PopFocusScope user error (+ SetCurrentWindow stack sizes fix), log text decorations (Button/Menu/TreeNode/Drag/Slider/InputText/Checkbox/Radio), DataTypeFormatString display, ImGuiDataType S64/U64 (upstream enum layout; doubles), sscanf %u/length modifiers, mouse arrays sized ImGuiMouseButton.COUNT, AddCallback userdata copy; TODO.txt refreshed

build/ImGui.linemap.json

@@ -1 +1 @@
-[[46, "imgui.lua"], [22668, "imgui_demo.lua"], [34519, "imgui_draw.lua"], [42824, "imgui_h.lua"], [45800, "imgui_impl_roblox.lua"], [47452, "imgui_impl_roblox_fonts.lua"], [53855, "imgui_internal.lua"], [57827, "imgui_tables.lua"], [62919, "imgui_widgets.lua"], [75061, "imstb_rectpack.lua"], [75725, "imstb_textedit.lua"], [77267, "imstb_truetype.lua"], [80055, "imstd_minstdio.lua"]]
+[[46, "imgui.lua"], [22675, "imgui_demo.lua"], [34533, "imgui_draw.lua"], [42860, "imgui_h.lua"], [45857, "imgui_impl_roblox.lua"], [47509, "imgui_impl_roblox_fonts.lua"], [53912, "imgui_internal.lua"], [57884, "imgui_tables.lua"], [62976, "imgui_widgets.lua"], [75210, "imstb_rectpack.lua"], [75874, "imstb_textedit.lua"], [77416, "imstb_truetype.lua"], [80204, "imstd_minstdio.lua"]]

build/imgui_love.linemap.json

@@ -1 +1 @@
-[[183, "imgui.lua"], [22805, "imgui_demo.lua"], [34656, "imgui_draw.lua"], [42961, "imgui_h.lua"], [45937, "imgui_impl_love.lua"], [46481, "imgui_internal.lua"], [50453, "imgui_tables.lua"], [55545, "imgui_widgets.lua"], [67687, "imstb_rectpack.lua"], [68351, "imstb_textedit.lua"], [69893, "imstb_truetype.lua"], [72681, "imstd_minstdio.lua"]]
+[[183, "imgui.lua"], [22812, "imgui_demo.lua"], [34670, "imgui_draw.lua"], [42997, "imgui_h.lua"], [45994, "imgui_impl_love.lua"], [46538, "imgui_internal.lua"], [50510, "imgui_tables.lua"], [55602, "imgui_widgets.lua"], [67836, "imstb_rectpack.lua"], [68500, "imstb_textedit.lua"], [70042, "imstb_truetype.lua"], [72830, "imstd_minstdio.lua"]]

docs/TODO.txt

@@ -6,26 +6,16 @@ Re-check with: python3 tools/test/missing.py [imgui|widgets|tables|draw]  and  p
 which exist as ImGui.DragFloat2 = DragFloatN(2) etc. Those are NOT gaps.)
 
 
-FEATURES NOT PORTED
+FEATURES NOT PORTED / PARTIAL
--------------------
+-----------------------------
-- Multi-select / box-select: BeginMultiSelect, EndMultiSelect, MultiSelectItemHeader/Footer, MultiSelectAddSetAll,
+- ImFont::AddRemapCodepointToGlyphIndex / FontSrcGetGlyphIndexFromCodepoint (needs the 1.93 font loader split).
-  MultiSelectAddSetRange, SetNextItemSelectionUserData, BeginBoxSelect/EndBoxSelect, DebugNodeMultiSelectState.
+- Default compressed font data (GetDefaultCompressedFontDataTTF / ProggyClean/ProggyForever embedded data):
-  (Selectable/TreeNode call sites are stubbed with TODOs; the demo "Selection State & Multi-Select" section is not ported.)
+  AddFontFromMemoryCompressedTTF works, but the default font comes from fonts/ instead.
-- Typing-select (type to jump in lists): GetTypingSelectRequest, TypingSelectFind*, DebugNodeTypingSelectState.
+- DebugLogSkippedErrors / DebugDrawIdConflicts* (Metrics error-recovery and ID-conflict debug tools).
-- Examples > Assets Browser (needs multi-select + box-select).
+- ImGuiDataType.S64/U64: supported, but values are Luau doubles: exact only within +-2^53 (LLONG_MAX/ULLONG_MAX
-- Metrics > Tools > Item Picker (UpdateDebugToolItemPicker).
+  round up to 2^63/2^64; U64 max prints as 18446744073709551615 via a special case).
-- DebugFlashStyleColor / UpdateDebugToolFlashStyleColor (Style Editor "?" flash button).
+- ImDrawList::AddCallback(userdata_size > 0): "copy" = shallow copy of a table userdata (no raw bytes in Lua).
-- DebugNodeInputTextState (Metrics > Internal state > InputText).
+- stb_truetype: cmap format 2 (high-byte mapping) asserts -- same as upstream stb_truetype ("@TODO").
-- BringWindowToDisplayBehind: stub, does nothing.
-- ColorEdit4 / ColorPicker4: drag & drop target (dropping a color onto a color widget).
-- ImFontAtlas:AddFontFromMemoryCompressedTTF: stub (binary_to_compressed_c fonts can't be loaded).
-- ImGuiSizeCallbackData: SetNextWindowSizeConstraints custom callbacks only partially supported
-  (Examples > Constrained Resize).
-- LogSetNextTextDecoration (Selectable "[ ]" decoration in log/clipboard output).
-- stb_truetype: cmap high-byte mapping (some CJK fonts assert).
-- Context hooks removal (RemoveContextHook), SetContextName.
-- RegisterUserTexture / UnregisterUserTexture.
-- ErrorCheckNewFrameSanityChecks / ErrorCheckEndFrameSanityChecks (fewer usage-error asserts than upstream).
 - GetAllocatorFunctions (n/a in Luau).
 
 WON'T DO (platform)
@@ -41,11 +31,9 @@ NOT VERIFIED LINE BY LINE AGAINST UPSTREAM
 KNOWN ISSUES
 ------------
 - Tables > "Columns flags": disabling every column asserts in TableUpdateLayout (upstream asserts too).
-- Style Editor > Colors uses a ListClipper (port-only change, upstream submits every row).
+- ImTriangulator ([Luau] deviation, imgui_draw.lua ImTriangulator_IsReflex): only strictly counter-clockwise corners are
-
+  reflex (upstream: also collinear/duplicate points), so polygons with duplicate points triangulate differently (no
-PERFORMANCE IDEAS (not done)
+  overlapping-triangle fallback).
-----------------------------
-- Cheaper visible ColorEdit4 rows; cheaper Begin() for child windows.
 
 PLANNED EXTENSIONS
 ------------------

imgui.lua

@@ -6489,7 +6489,7 @@ function ImGui.IsMouseDragPastThreshold(button, lock_threshold)
     if lock_threshold == nil then lock_threshold = -1.0 end
 
     local g = GImGui
-    IM_ASSERT(button >= 0 and button < 3) -- IM_COUNTOF(g.IO.MouseDown)
+    IM_ASSERT(button >= 0 and button < ImGuiMouseButton.COUNT) -- IM_COUNTOF(g.IO.MouseDown)
     if lock_threshold < 0.0 then
         lock_threshold = g.IO.MouseDragThreshold
     end
@@ -6502,7 +6502,7 @@ function ImGui.IsMouseDragging(button, lock_threshold)
     if lock_threshold == nil then lock_threshold = -1.0 end
 
     local g = GImGui
-    IM_ASSERT(button >= 0 and button < 3) -- IM_COUNTOF(g.IO.MouseDown)
+    IM_ASSERT(button >= 0 and button < ImGuiMouseButton.COUNT) -- IM_COUNTOF(g.IO.MouseDown)
     if not g.IO.MouseDown[button] then
         return false
     end
@@ -7048,7 +7048,7 @@ function ImGui.EndGroup()
     IM_ASSERT(group_data.WindowID == window.ID) -- EndGroup() in wrong window?
 
     if (window.DC.IsSetPos) then
-        -- TODO: ImGui.ErrorCheckUsingSetCursorPosToExtendParentBoundaries()
+        ImGui.ErrorCheckUsingSetCursorPosToExtendParentBoundaries()
     end
 
     -- Include LastItemData.Rect.Max as a workaround for e.g. EndTable() undershooting with CursorMaxPos report. (#7543)
@@ -7515,7 +7515,16 @@ function ImGui.BringWindowToDisplayBehind(window, behind_window)
     local g = GImGui
     window = window.RootWindow
     behind_window = behind_window.RootWindow
-    -- TODO:
+    local pos_wnd = ImGui.FindWindowDisplayIndex(window) + 1 -- 1-based
+    local pos_beh = ImGui.FindWindowDisplayIndex(behind_window) + 1
+    local data = g.Windows.Data
+    if pos_wnd < pos_beh then
+        for i = pos_wnd, pos_beh - 2 do data[i] = data[i + 1] end -- memmove
+        data[pos_beh - 1] = window
+    else
+        for i = pos_wnd, pos_beh + 1, -1 do data[i] = data[i - 1] end -- memmove
+        data[pos_beh] = window
+    end
 end
 
 --- @param under_this_window? ImGuiWindow
@@ -8298,7 +8307,7 @@ function MT.ImGuiIO:ClearInputMouse()
 
     self.MousePos = ImVec2(-FLT_MAX, -FLT_MAX)
 
-    for n = 0, 2 do -- IM_COUNTOF(MouseDown)
+    for n = 0, ImGuiMouseButton.COUNT - 1 do
         self.MouseDown[n] = false
         self.MouseDownDuration[n] = -1.0
         self.MouseDownDurationPrev[n] = -1.0
@@ -8841,7 +8850,6 @@ function ImGui.IsKeyPressedEx(key, flags, owner_id)
     return true
 end
 
--- TODO:
 -- Return untranslated names: on macOS, Cmd key will show as Ctrl, Ctrl key will show as super.
 function ImGui.GetKeyChordName(key_chord)
     local key = bit32.band(key_chord, bit32.bnot(ImGuiMod_Mask_))
@@ -9290,7 +9298,7 @@ end
 --- @return bool
 function ImGui.IsAnyMouseDown()
     local g = GImGui
-    for n = 0, 2 do -- IM_COUNTOF(g.IO.MouseDown) - 1
+    for n = 0, ImGuiMouseButton.COUNT - 1 do
         if g.IO.MouseDown[n] then
             return true
         end
@@ -9304,7 +9312,7 @@ function ImGui.IsMouseDown(button, owner_id)
     if owner_id == nil then owner_id = ImGuiKeyOwner_Any end
 
     local g = GImGui
-    IM_ASSERT(button >= 0 and button < 3) -- IM_COUNTOF(g.IO.MouseDown)
+    IM_ASSERT(button >= 0 and button < ImGuiMouseButton.COUNT) -- IM_COUNTOF(g.IO.MouseDown)
     return g.IO.MouseDown[button] and ImGui.TestKeyOwner(ImGui.MouseButtonToKey(button), owner_id) -- Should be same as IsKeyDown(MouseButtonToKey(button), owner_id), but this allows legacy code hijacking the io.Mousedown[] array.
 end
 
@@ -9324,7 +9332,7 @@ function ImGui.IsMouseClickedEx(button, flags, owner_id)
     if owner_id  == nil  then owner_id = ImGuiKeyOwner_Any end
 
     local g = GImGui
-    IM_ASSERT(button >= 0 and button < 3) -- IM_COUNTOF(g.IO.MouseDown)
+    IM_ASSERT(button >= 0 and button < ImGuiMouseButton.COUNT) -- IM_COUNTOF(g.IO.MouseDown)
 
     if not g.IO.MouseDown[button] then -- In theory this should already be encoded as (DownDuration < 0.0f), but testing this facilitates eating mechanism (until we finish work on key ownership)
         return false
@@ -9355,7 +9363,7 @@ function ImGui.IsMouseReleased(button, owner_id)
     if owner_id == nil then owner_id = ImGuiKeyOwner_Any end
 
     local g = GImGui
-    IM_ASSERT(button >= 0 and button < 3) -- IM_COUNTOF(g.IO.MouseDown)
+    IM_ASSERT(button >= 0 and button < ImGuiMouseButton.COUNT) -- IM_COUNTOF(g.IO.MouseDown)
     return g.IO.MouseReleased[button] and ImGui.TestKeyOwner(ImGui.MouseButtonToKey(button), owner_id) -- Should be same as IsKeyReleased(MouseButtonToKey(button), owner_id)
 end
 
@@ -9368,7 +9376,7 @@ end
 function ImGui.IsMouseReleasedWithDelay(button, delay)
     if delay == nil then delay = -1.0 end
     local g = GImGui
-    IM_ASSERT(button >= 0 and button < 3)
+    IM_ASSERT(button >= 0 and button < ImGuiMouseButton.COUNT) -- IM_COUNTOF(g.IO.MouseDown)
     if ImGui.IsMouseDown(button) then
         return false
     end
@@ -9384,14 +9392,14 @@ end
 function ImGui.IsMouseDoubleClicked(button, owner_id)
     if owner_id == nil then owner_id = ImGuiKeyOwner_Any end
     local g = GImGui
-    IM_ASSERT(button >= 0 and button < 3)
+    IM_ASSERT(button >= 0 and button < ImGuiMouseButton.COUNT) -- IM_COUNTOF(g.IO.MouseDown)
     return g.IO.MouseClickedCount[button] == 2 and ImGui.TestKeyOwner(ImGui.MouseButtonToKey(button), owner_id)
 end
 
 --- @param button ImGuiMouseButton
 function ImGui.GetMouseClickedCount(button)
     local g = GImGui
-    IM_ASSERT(button >= 0 and button < 3)
+    IM_ASSERT(button >= 0 and button < ImGuiMouseButton.COUNT) -- IM_COUNTOF(g.IO.MouseDown)
     return g.IO.MouseClickedCount[button]
 end
 
@@ -9482,7 +9490,7 @@ function ImGui.GetMouseDragDelta(button, lock_threshold)
     if button == nil then button = 0 end
     if lock_threshold == nil then lock_threshold = -1.0 end
     local g = GImGui
-    IM_ASSERT(button >= 0 and button < 3)
+    IM_ASSERT(button >= 0 and button < ImGuiMouseButton.COUNT) -- IM_COUNTOF(g.IO.MouseDown)
     if lock_threshold < 0.0 then
         lock_threshold = g.IO.MouseDragThreshold
     end
@@ -9500,7 +9508,7 @@ end
 function ImGui.ResetMouseDragDelta(button)
     if button == nil then button = 0 end
     local g = GImGui
-    IM_ASSERT(button >= 0 and button < 3)
+    IM_ASSERT(button >= 0 and button < ImGuiMouseButton.COUNT) -- IM_COUNTOF(g.IO.MouseDown)
     -- NB: We don't need to reset g.IO.MouseDragMaxDistanceSqr
     ImVec2_Copy(g.IO.MouseClickedPos[button], g.IO.MousePos)
 end
@@ -9945,14 +9953,13 @@ local function CalcWindowSizeAfterConstraint(window, size_desired)
         new_size.x = (cr.Min.x >= 0 and cr.Max.x >= 0) and ImClamp(new_size.x, cr.Min.x, cr.Max.x) or window.SizeFull.x
         new_size.y = (cr.Min.y >= 0 and cr.Max.y >= 0) and ImClamp(new_size.y, cr.Min.y, cr.Max.y) or window.SizeFull.y
         if g.NextWindowData.SizeCallback then
-            local data = {} -- TODO: ImGuiSizeCallbackData
+            local data = ImGuiSizeCallbackData()
             data.UserData = g.NextWindowData.SizeCallbackUserData
-            data.Pos = ImVec2(window.Pos.x, window.Pos.y)
+            ImVec2_Copy(data.Pos, window.Pos)
-            data.CurrentSize = ImVec2(window.SizeFull.x, window.SizeFull.y)
+            ImVec2_Copy(data.CurrentSize, window.SizeFull)
-            data.DesiredSize = ImVec2(new_size.x, new_size.y)
+            ImVec2_Copy(data.DesiredSize, new_size)
             g.NextWindowData.SizeCallback(data)
-            new_size.x = data.DesiredSize.x
+            ImVec2_Copy(new_size, data.DesiredSize)
-            new_size.y = data.DesiredSize.y
         end
         new_size.x = IM_TRUNC(new_size.x)
         new_size.y = IM_TRUNC(new_size.y)
@@ -11161,6 +11168,7 @@ local function SetCurrentWindow(window)
     local g = GImGui
     --- @diagnostic disable-next-line
     g.CurrentWindow = window
+    g.StackSizesInBeginForCurrentWindow = window and g.CurrentWindowStack:back().StackSizesInBegin or nil
     g.CurrentTable = (window and window.DC.CurrentTableIdx ~= -1) and g.Tables:GetByIndex(window.DC.CurrentTableIdx) or nil
 
     if window then
@@ -11177,7 +11185,6 @@ local function SetCurrentWindow(window)
     end
 end
 
--- TODO:
 function ImGui.GcCompactTransientMiscBuffers()
     local g = GImGui
     g.ItemFlagsStack:clear()
@@ -13399,7 +13406,6 @@ local function FindHoveredWindowEx(pos, find_first_and_in_any_viewport)
     return hovered_window, hovered_window_under_moving_window
 end
 
--- TODO:
 -- The reason this is exposed in imgui_internal.h is: on touch-based system that don't have hovering, we want to dispatch inputs to the right target (imgui vs imgui+app)
 function ImGui.UpdateHoveredWindowAndCaptureFlags(mouse_pos)
     local g = GImGui
@@ -13436,7 +13442,7 @@ function ImGui.UpdateHoveredWindowAndCaptureFlags(mouse_pos)
     local mouse_earliest_down = -1
     local mouse_any_down = false
 
-    for i = 0, 2 do -- IM_COUNTOF(io.MouseDown)
+    for i = 0, ImGuiMouseButton.COUNT - 1 do
         if io.MouseClicked[i] then
             io.MouseDownOwned[i] = (g.HoveredWindow ~= nil) or has_open_popup
             io.MouseDownOwnedUnlessPopupClose[i] = (g.HoveredWindow ~= nil) or has_open_modal
@@ -13525,7 +13531,7 @@ function ImGui.UpdateKeyboardInputs()
     end
 
     -- Update aliases
-    for n = 0, 2 do -- TODO: ImGuiMouseButton.COUNT - 1
+    for n = 0, ImGuiMouseButton.COUNT - 1 do
         ImGui.UpdateAliasKey(ImGui.MouseButtonToKey(n), io.MouseDown[n], io.MouseDown[n] and 1.0 or 0.0)
     end
     ImGui.UpdateAliasKey(ImGuiKey.MouseWheelX, io.MouseWheelH ~= 0.0, io.MouseWheelH)
@@ -13633,7 +13639,7 @@ function ImGui.UpdateMouseInputs()
         g.NavHighlightItemUnderNav = false
     end
 
-    for i = 0, 2 do -- IM_COUNTOF(io.MouseDown)
+    for i = 0, ImGuiMouseButton.COUNT - 1 do
         io.MouseClicked[i] = io.MouseDown[i] and (io.MouseDownDuration[i] < 0.0)
         io.MouseClickedCount[i] = 0 -- Will be filled below
         io.MouseReleased[i] = not io.MouseDown[i] and (io.MouseDownDuration[i] >= 0.0)
@@ -14585,7 +14591,6 @@ function ImGui.EndFrame()
     ImGui.CallContextHooks(g, ImGuiContextHookType.EndFramePost)
 end
 
--- TODO:
 -- Prepare the data for rendering so you can call GetDrawData()
 -- (As with anything within the ImGui:: namespace this doesn't touch your GPU or graphics API at all:
 -- it is the role of the ImGui_ImplXXXX_RenderDrawData() function provided by the renderer backend)
@@ -16452,7 +16457,7 @@ end
 
 function ImGui.PopFocusScope()
     local g = GImGui
-    -- TODO: IM_ASSERT_USER_ERROR_RET(g.FocusScopeStack.Size > g.StackSizesInBeginForCurrentWindow.SizeOfFocusScopeStack, "Calling PopFocusScope() too many times!")
+    IM_ASSERT_USER_ERROR_RET(g.FocusScopeStack.Size > g.StackSizesInBeginForCurrentWindow.SizeOfFocusScopeStack, "Calling PopFocusScope() too many times!")
     g.FocusScopeStack:pop_back()
     if g.FocusScopeStack.Size > 0 then
         g.CurrentFocusScopeId = g.FocusScopeStack:back().ID
@@ -19467,9 +19472,10 @@ function ImGui.ErrorCheckUsingSetCursorPosToExtendParentBoundaries()
     window.DC.IsSetPos = false
     if window.DC.CursorPos.x <= window.DC.CursorMaxPos.x and window.DC.CursorPos.y <= window.DC.CursorMaxPos.y then return end
     if window.SkipItems then return end
-    -- Upstream asserts (user error): "Code uses SetCursorPos()/SetCursorScreenPos() to extend window/parent boundaries.
+    IM_ASSERT_USER_ERROR(false, "Code uses SetCursorPos()/SetCursorScreenPos() to extend window/parent boundaries.\nPlease submit an item e.g. Dummy() afterwards in order to grow window/parent boundaries.")
-    -- Please submit an item e.g. Dummy() afterwards". We keep the old, tolerant behavior instead of erroring.
+
-    window.DC.CursorMaxPos = ImMax(window.DC.CursorMaxPos, window.DC.CursorPos)
+    -- For reference, the old behavior was essentially:
+    --window.DC.CursorMaxPos = ImMax(window.DC.CursorMaxPos, window.DC.CursorPos)
 end
 
 -------------------------------------------------------------------------------
@@ -22456,11 +22462,12 @@ function ImGui.ShowMetricsWindow(p_open)
         if ImGui.IsMousePosValid() then ImGui.Text("Mouse pos: (%g, %g)", io.MousePos.x, io.MousePos.y) else ImGui.Text("Mouse pos: <INVALID>") end
         ImGui.Text("Mouse delta: (%g, %g)", io.MouseDelta.x, io.MouseDelta.y)
         ImGui.Text("Mouse down:")
-        for i = 0, 2 do if ImGui.IsMouseDown(i) then ImGui.SameLine(); ImGui.Text("b%d (%.02f secs)", i, io.MouseDownDuration[i]) end end
+        local count = ImGuiMouseButton.COUNT -- IM_COUNTOF(io.MouseDown)
+        for i = 0, count - 1 do if ImGui.IsMouseDown(i) then ImGui.SameLine(); ImGui.Text("b%d (%.02f secs)", i, io.MouseDownDuration[i]) end end
         ImGui.Text("Mouse clicked:")
-        for i = 0, 2 do if ImGui.IsMouseClicked(i) then ImGui.SameLine(); ImGui.Text("b%d (%d)", i, io.MouseClickedCount[i]) end end
+        for i = 0, count - 1 do if ImGui.IsMouseClicked(i) then ImGui.SameLine(); ImGui.Text("b%d (%d)", i, io.MouseClickedCount[i]) end end
         ImGui.Text("Mouse released:")
-        for i = 0, 2 do if ImGui.IsMouseReleased(i) then ImGui.SameLine(); ImGui.Text("b%d", i) end end
+        for i = 0, count - 1 do if ImGui.IsMouseReleased(i) then ImGui.SameLine(); ImGui.Text("b%d", i) end end
         ImGui.Text("Mouse wheel: %.1f", io.MouseWheel)
         ImGui.Text("MouseStationaryTimer: %.2f", g.MouseStationaryTimer)
         ImGui.Text("Mouse source: %s", GetMouseSourceName(io.MouseSource))

imgui_demo.lua

@@ -1520,7 +1520,8 @@ S.DemoWindowWidgetsDataTypes = {
     u16_v = 65535,
     s32_v = -1,
     u32_v = 4294967295, -- (ImU32)-1
-    -- [Port] s64_v / u64_v: 64-bit integer types are not supported (Lua numbers are doubles)
+    s64_v = -1,
+    u64_v = 18446744073709551615, -- (ImU64)-1 [Port] Lua numbers are doubles: 64-bit values are exact only within +-2^53
     f32_v = 0.123,
     f64_v = 90000.01234567890123456789,
     drag_clamp = false,
@@ -1551,14 +1552,15 @@ function DemoWindowWidgetsDataTypes()
 
         -- Setup limits (as helper variables so we can take their address, as explained above)
         -- Note: SliderScalar() functions have a maximum usable range of half the natural type maximum, hence the /2.
-        -- [Port] LLONG_MIN/LLONG_MAX/ULLONG_MAX fallback block dropped: no 64-bit integer types
+        local LLONG_MIN, LLONG_MAX, ULLONG_MAX = -9223372036854775808, 9223372036854775807, 18446744073709551615 -- [Port] doubles (LLONG_MAX/ULLONG_MAX round up)
         local s8_zero,  s8_one,  s8_fifty,  s8_min,  s8_max  = 0, 1, 50, -128, 127
         local u8_zero,  u8_one,  u8_fifty,  u8_min,  u8_max  = 0, 1, 50, 0, 255
         local s16_zero, s16_one, s16_fifty, s16_min, s16_max = 0, 1, 50, -32768, 32767
         local u16_zero, u16_one, u16_fifty, u16_min, u16_max = 0, 1, 50, 0, 65535
         local s32_zero, s32_one, s32_fifty, s32_min, s32_max, s32_hi_a, s32_hi_b = 0, 1, 50, -1073741824, 1073741823, 1073741823 - 100, 1073741823 -- INT_MIN/2, INT_MAX/2
         local u32_zero, u32_one, u32_fifty, u32_min, u32_max, u32_hi_a, u32_hi_b = 0, 1, 50, 0, 2147483647, 2147483647 - 100, 2147483647 -- UINT_MAX/2
-        -- [Port] s64_* / u64_* limits: ImGuiDataType.S64/U64 are not supported
+        local s64_zero, s64_one, s64_fifty, s64_min, s64_max, s64_hi_a, s64_hi_b = 0, 1, 50, LLONG_MIN / 2, LLONG_MAX / 2, LLONG_MAX / 2 - 100, LLONG_MAX / 2
+        local u64_zero, u64_one, u64_fifty, u64_min, u64_max, u64_hi_a, u64_hi_b = 0, 1, 50, 0, ULLONG_MAX / 2, ULLONG_MAX / 2 - 100, ULLONG_MAX / 2
         local f32_zero, f32_one, f32_lo_a, f32_hi_a = 0.0, 1.0, -10000000000.0, 10000000000.0
         local f64_zero, f64_one, f64_lo_a, f64_hi_a = 0.0, 1.0, -1000000000000000.0, 1000000000000000.0
 
@@ -1580,8 +1582,8 @@ function DemoWindowWidgetsDataTypes()
         s.s32_v = ImGui.DragScalar("drag s32",       ImGuiDataType.S32,    s.s32_v, drag_speed, drag_clamp and s32_zero or nil, drag_clamp and s32_fifty or nil)
         s.s32_v = ImGui.DragScalar("drag s32 hex",   ImGuiDataType.S32,    s.s32_v, drag_speed, drag_clamp and s32_zero or nil, drag_clamp and s32_fifty or nil, "0x%08X")
         s.u32_v = ImGui.DragScalar("drag u32",       ImGuiDataType.U32,    s.u32_v, drag_speed, drag_clamp and u32_zero or nil, drag_clamp and u32_fifty or nil, "%u ms")
-        -- [Port] ImGui.DragScalar("drag s64",       ImGuiDataType.S64,    s64_v, ...) -- 64-bit types not supported
+        s.s64_v = ImGui.DragScalar("drag s64",       ImGuiDataType.S64,    s.s64_v, drag_speed, drag_clamp and s64_zero or nil, drag_clamp and s64_fifty or nil)
-        -- [Port] ImGui.DragScalar("drag u64",       ImGuiDataType.U64,    u64_v, ...) -- 64-bit types not supported
+        s.u64_v = ImGui.DragScalar("drag u64",       ImGuiDataType.U64,    s.u64_v, drag_speed, drag_clamp and u64_zero or nil, drag_clamp and u64_fifty or nil)
         s.f32_v = ImGui.DragScalar("drag float",     ImGuiDataType.Float,  s.f32_v, 0.005,  f32_zero, f32_one, "%f")
         s.f32_v = ImGui.DragScalar("drag float log", ImGuiDataType.Float,  s.f32_v, 0.005,  f32_zero, f32_one, "%f", ImGuiSliderFlags.Logarithmic)
         s.f64_v = ImGui.DragScalar("drag double",    ImGuiDataType.Double, s.f64_v, 0.0005, f64_zero, nil,     "%.10f grams")
@@ -1600,8 +1602,12 @@ function DemoWindowWidgetsDataTypes()
         s.u32_v = ImGui.SliderScalar("slider u32 low",       ImGuiDataType.U32,    s.u32_v, u32_zero, u32_fifty,"%u")
         s.u32_v = ImGui.SliderScalar("slider u32 high",      ImGuiDataType.U32,    s.u32_v, u32_hi_a, u32_hi_b, "%u")
         s.u32_v = ImGui.SliderScalar("slider u32 full",      ImGuiDataType.U32,    s.u32_v, u32_min,  u32_max,  "%u")
-        -- [Port] "slider s64 low" / "slider s64 high" / "slider s64 full" (ImGuiDataType.S64): 64-bit types not supported
+        s.s64_v = ImGui.SliderScalar("slider s64 low",       ImGuiDataType.S64,    s.s64_v, s64_zero, s64_fifty,"%lld") -- "%" PRId64
-        -- [Port] "slider u64 low" / "slider u64 high" / "slider u64 full" (ImGuiDataType.U64): 64-bit types not supported
+        s.s64_v = ImGui.SliderScalar("slider s64 high",      ImGuiDataType.S64,    s.s64_v, s64_hi_a, s64_hi_b, "%lld")
+        s.s64_v = ImGui.SliderScalar("slider s64 full",      ImGuiDataType.S64,    s.s64_v, s64_min,  s64_max,  "%lld")
+        s.u64_v = ImGui.SliderScalar("slider u64 low",       ImGuiDataType.U64,    s.u64_v, u64_zero, u64_fifty,"%llu ms") -- "%" PRIu64 " ms"
+        s.u64_v = ImGui.SliderScalar("slider u64 high",      ImGuiDataType.U64,    s.u64_v, u64_hi_a, u64_hi_b, "%llu ms")
+        s.u64_v = ImGui.SliderScalar("slider u64 full",      ImGuiDataType.U64,    s.u64_v, u64_min,  u64_max,  "%llu ms")
         s.f32_v = ImGui.SliderScalar("slider float low",     ImGuiDataType.Float,  s.f32_v, f32_zero, f32_one)
         s.f32_v = ImGui.SliderScalar("slider float low log", ImGuiDataType.Float,  s.f32_v, f32_zero, f32_one,  "%.10f", ImGuiSliderFlags.Logarithmic)
         s.f32_v = ImGui.SliderScalar("slider float high",    ImGuiDataType.Float,  s.f32_v, f32_lo_a, f32_hi_a, "%e")
@@ -1614,7 +1620,8 @@ function DemoWindowWidgetsDataTypes()
         s.u8_v  = ImGui.SliderScalar("slider u8 reverse",    ImGuiDataType.U8,   s.u8_v,  u8_max,    u8_min,   "%u")
         s.s32_v = ImGui.SliderScalar("slider s32 reverse",   ImGuiDataType.S32,  s.s32_v, s32_fifty, s32_zero, "%d")
         s.u32_v = ImGui.SliderScalar("slider u32 reverse",   ImGuiDataType.U32,  s.u32_v, u32_fifty, u32_zero, "%u")
-        -- [Port] "slider s64 reverse" / "slider u64 reverse": 64-bit types not supported
+        s.s64_v = ImGui.SliderScalar("slider s64 reverse",   ImGuiDataType.S64,  s.s64_v, s64_fifty, s64_zero, "%lld")
+        s.u64_v = ImGui.SliderScalar("slider u64 reverse",   ImGuiDataType.U64,  s.u64_v, u64_fifty, u64_zero, "%llu ms")
 
         IMGUI_DEMO_MARKER("Widgets/Data Types/Inputs")
         ImGui.SeparatorText("Inputs")
@@ -1631,8 +1638,8 @@ function DemoWindowWidgetsDataTypes()
         s.s32_v = ImGui.InputScalar("input s32 hex", ImGuiDataType.S32,    s.s32_v, inputs_step and s32_one or nil, nil, "%04X", flags)
         s.u32_v = ImGui.InputScalar("input u32",     ImGuiDataType.U32,    s.u32_v, inputs_step and u32_one or nil, nil, "%u", flags)
         s.u32_v = ImGui.InputScalar("input u32 hex", ImGuiDataType.U32,    s.u32_v, inputs_step and u32_one or nil, nil, "%08X", flags)
-        -- [Port] ImGui.InputScalar("input s64",     ImGuiDataType.S64, ...) -- 64-bit types not supported
+        s.s64_v = ImGui.InputScalar("input s64",     ImGuiDataType.S64,    s.s64_v, inputs_step and s64_one or nil, nil, nil, flags)
-        -- [Port] ImGui.InputScalar("input u64",     ImGuiDataType.U64, ...) -- 64-bit types not supported
+        s.u64_v = ImGui.InputScalar("input u64",     ImGuiDataType.U64,    s.u64_v, inputs_step and u64_one or nil, nil, nil, flags)
         s.f32_v = ImGui.InputScalar("input float",   ImGuiDataType.Float,  s.f32_v, inputs_step and f32_one or nil, nil, nil, flags)
         s.f64_v = ImGui.InputScalar("input double",  ImGuiDataType.Double, s.f64_v, inputs_step and f64_one or nil, nil, nil, flags)
 
@@ -8188,10 +8195,10 @@ function DemoWindowInputs()
             end
             ImGui.Text("Mouse delta: (%g, %g)", io.MouseDelta.x, io.MouseDelta.y)
             ImGui.Text("Mouse down:")
-            for i = 0, 2 do if ImGui.IsMouseDown(i) then ImGui.SameLine(); ImGui.Text("b%d (%.02f secs)", i, io.MouseDownDuration[i]) end end -- IM_COUNTOF(io.MouseDown) == 3, 0-based
+            for i = 0, ImGuiMouseButton.COUNT - 1 do if ImGui.IsMouseDown(i) then ImGui.SameLine(); ImGui.Text("b%d (%.02f secs)", i, io.MouseDownDuration[i]) end end -- IM_COUNTOF(io.MouseDown), 0-based
             ImGui.Text("Mouse wheel: %.1f", io.MouseWheel)
             ImGui.Text("Mouse clicked count:")
-            for i = 0, 2 do if io.MouseClickedCount[i] > 0 then ImGui.SameLine(); ImGui.Text("b%d: %d", i, io.MouseClickedCount[i]) end end
+            for i = 0, ImGuiMouseButton.COUNT - 1 do if io.MouseClickedCount[i] > 0 then ImGui.SameLine(); ImGui.Text("b%d: %d", i, io.MouseClickedCount[i]) end end
 
             -- We iterate both legacy native range and named ImGuiKey ranges. This is a little unusual/odd but this allows
             -- displaying the data for old/new backends.

imgui_draw.lua

@@ -4144,6 +4144,16 @@ function ImGui.AddDrawListToDrawDataEx(draw_data, out_list, draw_list)
         IM_ASSERT(draw_list._VtxCurrentIdx == draw_list.VtxBuffer.Size + 1)
     end
 
+    -- Resolve callback data pointers
+    local cb_buf = draw_list._CallbacksDataBuf
+    if cb_buf.Size > 0 then
+        for _, cmd in draw_list.CmdBuffer:iter() do
+            if cmd.UserCallback ~= nil and cmd.UserCallbackDataOffset ~= -1 and cmd.UserCallbackDataSize > 0 then
+                cmd.UserCallbackData = cb_buf.Data[cmd.UserCallbackDataOffset + 1]
+            end
+        end
+    end
+
     -- Add to output list + records state in ImDrawData
     out_list:push_back(draw_list)
     draw_data.TotalVtxCount = draw_data.TotalVtxCount + draw_list.VtxBuffer.Size
@@ -4250,7 +4260,6 @@ end
 
 -- Initialize before use in a new frame. We always have a command ready in the buffer.
 -- In the majority of cases, you would want to call PushClipRect() and PushTexture() after this.
--- TODO:
 function MT.ImDrawList:_ResetForNewFrame()
     self._ContentClipX0 = nil -- set again by Begin() (Roblox backend scroll reuse)
     if self._Splitter._Count > 1 then
@@ -4272,6 +4281,7 @@ function MT.ImDrawList:_ResetForNewFrame()
     self._IdxWritePtr = 1
     self._ClipRectStack:resize(0)
     self._TextureStack:resize(0)
+    self._CallbacksDataBuf:resize(0)
     self._DrawFlagsStack.Size = 0 -- _DrawFlagsStack.clear() (ImSmallStack_)
     self._Path:resize(0)
 
@@ -4292,7 +4302,7 @@ function MT.ImDrawList:_ClearFreeMemory()
 
     self._ClipRectStack:clear()
     self._TextureStack:clear()
-    -- self._CallbacksDataBuf:clear()
+    self._CallbacksDataBuf:clear()
     self._DrawFlagsStack.Size = 0 -- _DrawFlagsStack.clear() (ImSmallStack_)
     self._Path:clear()
     self._Splitter:ClearFreeMemory()
@@ -4365,15 +4375,27 @@ function MT.ImDrawList:AddCallback(callback, userdata, userdata_size)
         curr_cmd = self.CmdBuffer.Data[self.CmdBuffer.Size]
     end
     curr_cmd.UserCallback = callback
-    -- TODO: _CallbacksDataBuf?
     if userdata_size == 0 then
         -- Store user data directly in command (no indirection)
         curr_cmd.UserCallbackData = userdata
-
+        curr_cmd.UserCallbackDataSize = 0
+        curr_cmd.UserCallbackDataOffset = -1
     else
+        -- Copy and store user data in a buffer
+        -- [Lua] No raw bytes: the "copy" is a shallow copy of a table userdata (other values are immutable and stored as is),
+        -- so later changes to the caller's table don't affect this command. userdata_size is only recorded.
         IM_ASSERT(userdata ~= nil)
-        IM_ASSERT(userdata_size < bit32.lshift(1, 31))
+        IM_ASSERT(userdata_size < 2147483648) -- (1u << 31)
-
+        curr_cmd.UserCallbackData = nil -- Will be resolved during Render()
+        curr_cmd.UserCallbackDataSize = userdata_size
+        curr_cmd.UserCallbackDataOffset = self._CallbacksDataBuf.Size -- 0-based
+        local copy = userdata
+        if type(userdata) == "table" then
+            copy = {}
+            for k, v in pairs(userdata) do copy[k] = v end
+            setmetatable(copy, getmetatable(userdata))
+        end
+        self._CallbacksDataBuf:push_back(copy) -- memcpy()
     end
 
     self:AddDrawCmd() -- Force a new command after us (see comment below)

imgui_h.lua

@@ -75,6 +75,14 @@ function ImU32(val) return bitAnd(val, 0xFFFFFFFF) end
 --- @return ImS32
 function ImS32(val) return bitAnd(val, 0xFFFFFFFF) end
 
+-- [Luau] 64-bit integers are stored in doubles (exact only within +-2^53): the cast just truncates toward zero like a C double->int64 cast.
+--- @param val number
+--- @return ImS64
+function ImS64(val) if val >= 0 then return math.floor(val) end return -math.floor(-val) end
+--- @param val number
+--- @return ImU64
+function ImU64(val) if val >= 0 then return math.floor(val) end return -math.floor(-val) end
+
 --- @alias float          number
 --- @class double : number
 
@@ -155,15 +163,17 @@ ImGuiDataType =
     U16    = 3, -- unsigned short
     S32    = 4, -- int
     U32    = 5, -- unsigned int
-    Float  = 6, -- float
+    S64    = 6, -- long long / __int64 -- [Luau] stored in a double: exact only within +-2^53
-    Double = 7, -- double
+    U64    = 7, -- unsigned long long / unsigned __int64 -- [Luau] stored in a double: exact only within 0..2^53
-    Bool   = 8, -- bool (provided for user convenience, not supported by scalar widgets)
+    Float  = 8, -- float
-    String = 9, -- string (provided for user convenience, not supported by scalar widgets)
+    Double = 9, -- double
-    COUNT  = 10
+    Bool   = 10, -- bool (provided for user convenience, not supported by scalar widgets)
+    String = 11, -- string (provided for user convenience, not supported by scalar widgets)
+    COUNT  = 12
 }
 -- Extend ImGuiDataType_
-ImGuiDataType.Pointer = 11 -- [internal]
+ImGuiDataType.Pointer = ImGuiDataType.COUNT -- [internal]
-ImGuiDataType.ID      = 12 -- [internal]
+ImGuiDataType.ID      = ImGuiDataType.COUNT + 1 -- [internal]
 
 ImTextureID_Invalid = -1
 
@@ -673,7 +683,7 @@ function ImDrawList(data)
         _Splitter      = ImDrawListSplitter(), -- [Internal] for channels api (note: prefer using your own persistent instance of ImDrawListSplitter!)
         _ClipRectStack = ImVector(), -- [Internal]
         _TextureStack  = ImVector(), -- [Internal]
-        _CallbacksDataBuf = nil, -- [Internal]
+        _CallbacksDataBuf = ImVector(), -- [Internal] [Lua] copies of AddCallback() userdata (userdata_size > 0)
         _DrawFlagsStack = ImVector(), -- [Internal] ImSmallStack_<ImDrawFlags,3>: capacity checked by PushDrawFlag()
         _FringeScale = 1.0, -- [Internal] anti-alias fringe is scaled by this value, this helps to keep things sharp while zooming at vertex buffer content -- [Luau] 1.0 instead of memset 0 so a list used before _SetPixelDensity() still works
         _InvFringeScale = 1.0, -- [internal] 1.0 / _FringeScale // FIXME: Consider renaming to _PixelDensity.
@@ -1258,7 +1268,7 @@ function ImGuiIO()
 
         MouseDelta = ImVec2(), -- Mouse delta. Note that this is zero if either current or previous position are invalid (-FLT_MAX,-FLT_MAX), so a disappearing/reappearing mouse won't have a huge delta.
 
-        MouseDown = {[0] = false, [1] = false, [2] = false}, -- Mouse buttons: 0=left, 1=right, 2=middle + extras (ImGuiMouseButton.COUNT == 5). Dear ImGui mostly uses left and right buttons. Other buttons allow us to track if the mouse is being used by your application + available to user as a convenience via IsMouse** API.
+        MouseDown = {[0] = false, [1] = false, [2] = false, [3] = false, [4] = false}, -- Mouse buttons: 0=left, 1=right, 2=middle + extras (ImGuiMouseButton.COUNT == 5). Dear ImGui mostly uses left and right buttons. Other buttons allow us to track if the mouse is being used by your application + available to user as a convenience via IsMouse** API.
 
         MouseWheel = 0, -- Mouse wheel Vertical: 1 unit scrolls about 5 lines text. >0 scrolls Up, <0 scrolls Down. Hold Shift to turn vertical scroll into horizontal scroll.
         MouseWheelH = 0, -- Mouse wheel Horizontal. >0 scrolls Left, <0 scrolls Right. Most users don't have a mouse with a horizontal wheel, may not be filled by all backends.
@@ -1360,23 +1370,23 @@ function ImGuiIO()
         -- (you can visualize and interact with all options in 'Demo->Configuration')
         MouseDrawCursor = false, -- = false          -- Request ImGui to draw a mouse cursor for you (if you are on a platform without a mouse cursor). Cannot be easily renamed to 'io.ConfigXXX' because this is frequently used by backend implementations.
 
-        MouseClicked          = {[0] = false, [1] = false, [2] = false}, -- Mouse button went from !Down to Down (same as MouseClickedCount[x] != 0)
+        MouseClicked          = {[0] = false, [1] = false, [2] = false, [3] = false, [4] = false}, -- Mouse button went from !Down to Down (same as MouseClickedCount[x] != 0)
-        MouseReleased         = {[0] = false, [1] = false, [2] = false}, -- Mouse button went from Down to !Down
+        MouseReleased         = {[0] = false, [1] = false, [2] = false, [3] = false, [4] = false}, -- Mouse button went from Down to !Down
-        MouseClickedCount     = {[0] =  0, [1] =  0, [2] =  0}, -- == 0 (not clicked), == 1 (same as MouseClicked[]), == 2 (double-clicked), == 3 (triple-clicked) etc. when going from !Down to Down
+        MouseClickedCount     = {[0] = 0, [1] = 0, [2] = 0, [3] = 0, [4] = 0}, -- == 0 (not clicked), == 1 (same as MouseClicked[]), == 2 (double-clicked), == 3 (triple-clicked) etc. when going from !Down to Down
-        MouseClickedLastCount = {[0] =  0, [1] =  0, [2] =  0}, -- Count successive number of clicks. Stays valid after mouse release. Reset after another click is done.
+        MouseClickedLastCount = {[0] = 0, [1] = 0, [2] = 0, [3] = 0, [4] = 0}, -- Count successive number of clicks. Stays valid after mouse release. Reset after another click is done.
-        MouseDownDuration     = {[0] = -1, [1] = -1, [2] = -1}, -- Duration the mouse button has been down (0.0f == just clicked)
+        MouseDownDuration     = {[0] = -1, [1] = -1, [2] = -1, [3] = -1, [4] = -1}, -- Duration the mouse button has been down (0.0f == just clicked)
-        MouseDownDurationPrev = {[0] = -1, [1] = -1, [2] = -1}, -- Previous time the mouse button has been down
+        MouseDownDurationPrev = {[0] = -1, [1] = -1, [2] = -1, [3] = -1, [4] = -1}, -- Previous time the mouse button has been down
 
-        MouseDragMaxDistanceAbs = {[0] = ImVec2(), [1] = ImVec2(), [2] = ImVec2()}, -- Maximum distance, absolute, on each axis, of how much mouse has traveled from the clicking point
+        MouseDragMaxDistanceAbs = {[0] = ImVec2(), [1] = ImVec2(), [2] = ImVec2(), [3] = ImVec2(), [4] = ImVec2()}, -- Maximum distance, absolute, on each axis, of how much mouse has traveled from the clicking point
-        MouseDragMaxDistanceSqr = {[0] = 0, [1] = 0, [2] = 0}, -- Squared maximum distance of how much mouse has traveled from the clicking point (used for moving thresholds)
+        MouseDragMaxDistanceSqr = {[0] = 0, [1] = 0, [2] = 0, [3] = 0, [4] = 0}, -- Squared maximum distance of how much mouse has traveled from the clicking point (used for moving thresholds)
 
-        MouseDownOwned    = {[0] = nil, [1] = nil, [2] = nil}, -- Track if button was clicked inside a dear imgui window or over void blocked by a popup. We don't request mouse capture from the application if click started outside ImGui bounds.
+        MouseDownOwned    = {[0] = nil, [1] = nil, [2] = nil, [3] = nil, [4] = nil}, -- Track if button was clicked inside a dear imgui window or over void blocked by a popup. We don't request mouse capture from the application if click started outside ImGui bounds.
-        MouseDownOwnedUnlessPopupClose = {[0] = nil, [1] = nil, [2] = nil}, -- Track if button was clicked inside a dear imgui window.
+        MouseDownOwnedUnlessPopupClose = {[0] = nil, [1] = nil, [2] = nil, [3] = nil, [4] = nil}, -- Track if button was clicked inside a dear imgui window.
-        MouseClickedTime  = {[0] = 0, [1] = 0, [2] = 0}, -- Time of last click (used to figure out double-click)
+        MouseClickedTime  = {[0] = 0, [1] = 0, [2] = 0, [3] = 0, [4] = 0}, -- Time of last click (used to figure out double-click)
-        MouseReleasedTime = {[0] = 0, [1] = 0, [2] = 0}, -- Time of last released (rarely used! but useful to handle delayed single-click when trying to disambiguate them from double-click).
+        MouseReleasedTime = {[0] = 0, [1] = 0, [2] = 0, [3] = 0, [4] = 0}, -- Time of last released (rarely used! but useful to handle delayed single-click when trying to disambiguate them from double-click).
-        MouseClickedPos   = {[0] = ImVec2(), [1] = ImVec2(), [2] = ImVec2()}, -- Position at time of clicking
+        MouseClickedPos   = {[0] = ImVec2(), [1] = ImVec2(), [2] = ImVec2(), [3] = ImVec2(), [4] = ImVec2()}, -- Position at time of clicking
 
-        MouseDoubleClicked = {[0] = false, [1] = false, [2] = false}, -- Has mouse button been double-clicked? (same as MouseClickedCount[x] == 2)
+        MouseDoubleClicked = {[0] = false, [1] = false, [2] = false, [3] = false, [4] = false}, -- Has mouse button been double-clicked? (same as MouseClickedCount[x] == 2)
 
         -- Inputs Behaviors
         -- (other variables, ones which are expected to be tweaked within UI code, are exposed in ImGuiStyle)
@@ -2777,6 +2787,17 @@ ImGuiTableBgTarget = { None = 0, RowBg0 = 1, RowBg1 = 2, CellBg = 3 }
 --- @enum ImGuiSortDirection
 ImGuiSortDirection = { None = 0, Ascending = 1, Descending = 2 }
 
+-- Resizing callback data to apply custom constraint. As enabled by SetNextWindowSizeConstraints(). Callback is called during the next Begin().
+-- NB: For basic min/max size constraint on each axis you don't need to use the callback! The SetNextWindowSizeConstraints() parameters are enough.
+--- @class ImGuiSizeCallbackData
+--- @field UserData    any     Read-only.   What user passed to SetNextWindowSizeConstraints(). Generally store an integer or float in here.
+--- @field Pos         ImVec2  Read-only.   Window position, for reference.
+--- @field CurrentSize ImVec2  Read-only.   Current window size.
+--- @field DesiredSize ImVec2  Read-write.  Desired size, based on user's mouse position. Write to this field to restrain resizing.
+--- @return ImGuiSizeCallbackData
+function ImGuiSizeCallbackData()
+    return { UserData = nil, Pos = ImVec2(), CurrentSize = ImVec2(), DesiredSize = ImVec2() }
+end
 
 
 -- Data payload for Drag and Drop operations: AcceptDragDropPayload(), GetDragDropPayload()

imgui_widgets.lua

@@ -54,6 +54,11 @@ local IM_S32_MIN = INT_MIN -- (-2147483647 - 1), (0x80000000);
 local IM_S32_MAX = INT_MAX -- (2147483647), (0x7FFFFFFF)
 local IM_U32_MIN = 0
 local IM_U32_MAX = UINT_MAX -- (0xFFFFFFFF)
+-- [Luau] 64-bit limits as doubles: IM_S64_MAX/IM_U64_MAX round up to 2^63/2^64 (values are exact only within +-2^53)
+local IM_S64_MIN = -9223372036854775808 -- (-9223372036854775807ll - 1ll)
+local IM_S64_MAX = 9223372036854775807 -- (9223372036854775807ll)
+local IM_U64_MIN = 0
+local IM_U64_MAX = 18446744073709551615 -- (0xFFFFFFFFFFFFFFFFull)
 
 -------------------------------------------------------------------------------
 -- [SECTION] Widgets: Text, etc.
@@ -786,8 +791,9 @@ function ImGui.ButtonEx(label, size_arg, flags)
     ImGui.RenderNavCursor(bb, id)
     ImGui.RenderFrame(bb.Min, bb.Max, col, true, style.FrameRounding)
 
-    -- if (g.LogEnabled)
+    if g.LogEnabled then
-    --     LogSetNextTextDecoration("[", "]");
+        ImGui.LogSetNextTextDecoration("[", "]")
+    end
     local text_min, text_max = ButtonEx_text_min, ButtonEx_text_max -- [Luau] scratch: RenderTextClipped() only reads them
     text_min.x = bb.Min.x + frame_padding.x; text_min.y = bb.Min.y + frame_padding.y
     text_max.x = bb.Max.x - frame_padding.x; text_max.y = bb.Max.y - frame_padding.y
@@ -1369,7 +1375,7 @@ function ImGui.Checkbox(label, v)
     end
 
     if g.LogEnabled then
-        -- ImGui.LogRenderedText(label_pos, mixed_value and "[~]" or (v and "[x]" or "[ ]"))
+        ImGui.LogRenderedText(ImVec2(check_bb.Max.x + style.ItemInnerSpacing.x, check_bb.Min.y + style.FramePadding.y), mixed_value and "[~]" or (v and "[x]" or "[ ]")) -- label_pos
     end
 
     if is_visible and label_size.x > 0.0 then
@@ -1466,7 +1472,7 @@ function ImGui.RadioButtonEx(label, active)
     end
     local label_pos = ImVec2(check_bb.Max.x + style.ItemInnerSpacing.x, check_bb.Min.y + style.FramePadding.y)
     if g.LogEnabled then
-        -- ImGui.LogRenderedText(label_pos, active and "(x)" or "( )")
+        ImGui.LogRenderedText(label_pos, active and "(x)" or "( )")
     end
     if label_size.x > 0.0 then
         ImGui.RenderText(label_pos, label, 1, label_end, false)
@@ -1788,7 +1794,7 @@ function ImGui.SeparatorEx(flags, thickness)
             -- Draw
             window.DrawList:AddRectFilled(bb.Min, bb.Max, ImGui.GetColorU32(ImGuiCol.Separator))
             if g.LogEnabled then
-                ImGui.LogRenderedText(bb.Min, "--------------------------------")
+                ImGui.LogRenderedText(bb.Min, "--------------------------------\n")
             end
         end
 
@@ -2347,6 +2353,8 @@ local GDataTypeInfo = {
     ImGuiDataTypeInfo(2, "U16",    "%u",   "%u"),
     ImGuiDataTypeInfo(4, "S32",    "%d",   "%d"), -- ImGuiDataType.S32
     ImGuiDataTypeInfo(4, "U32",    "%u",   "%u"),
+    ImGuiDataTypeInfo(8, "S64",    "%lld", "%lld"), -- ImGuiDataType.S64
+    ImGuiDataTypeInfo(8, "U64",    "%llu", "%llu"),
     ImGuiDataTypeInfo(4, "float",  "%.3f", "%f"), -- ImGuiDataType.Float
     ImGuiDataTypeInfo(8, "double", "%f",   "%lf"), -- ImGuiDataType.Double
     ImGuiDataTypeInfo(1, "bool",   "%d",   "%d"), -- ImGuiDataType.Bool
@@ -2359,33 +2367,64 @@ function ImGui.DataTypeGetInfo(data_type)
     return GDataTypeInfo[data_type + 1]
 end
 
+-- [Luau] string.format() has no length modifiers (%lld, %I64d...) and formats negative numbers as 64-bit for %u/%x/%X/%o:
+-- strip modifiers and re-apply C's integer promotion/two's complement for signed types.
+local DataTypeFormatStringCached do
+local fmt_info_memo = {} -- format -> { stripped format, is unsigned conversion }
+local function GetFormatInfo(format)
+    local info = fmt_info_memo[format]
+    if info == nil then
+        local stripped = string.gsub(string.gsub(format, "(%%[-+ #0']*%d*%.?%d*)[hlLqjzt]+", "%1"), "(%%[-+ #0']*%d*%.?%d*)I64", "%1")
+        local conv = string.match(stripped, "%%[-+ #0']*%d*%.?%d*([diouxXc])")
+        info = { stripped, conv == "u" or conv == "x" or conv == "X" or conv == "o" }
+        fmt_info_memo[format] = info
+    end
+    return info
+end
+
+--- Lua-string version of DataTypeFormatString() (memoized), used for display.
+--- @param data_type ImGuiDataType
+--- @param data      number
+--- @param format    string
+--- @return string
+function DataTypeFormatStringCached(data_type, data, format)
+    if data_type == ImGuiDataType.Float or data_type == ImGuiDataType.Double then
+        return FormatCached(format, data)
+    end
+    local info = GetFormatInfo(format)
+    if     data_type == ImGuiDataType.S8  then data = (ImS8)(data)
+    elseif data_type == ImGuiDataType.U8  then data = (ImU8)(data)
+    elseif data_type == ImGuiDataType.S16 then data = (ImS16)(data)
+    elseif data_type == ImGuiDataType.U16 then data = (ImU16)(data)
+    elseif data_type == ImGuiDataType.S32 then -- (signed values are already stored signed)
+    elseif data_type == ImGuiDataType.U32 then data = (ImU32)(data)
+    elseif data_type == ImGuiDataType.S64 or data_type == ImGuiDataType.U64 then
+        -- (string.format() already prints negative numbers as 64-bit two's complement for %u/%x/%X/%o)
+        if info[2] then
+            if data >= 18446744073709551616 then data = -1 end -- (ImU64)-1 rounds to 2^64 in a double: print ULLONG_MAX
+        elseif data >= 9223372036854775808 then
+            data = 9223372036854774784 -- largest double below 2^63 (LLONG_MAX isn't representable)
+        end
+        return FormatCached(info[1], data)
+    else
+        IM_ASSERT(false)
+    end
+    if data < 0 and info[2] then data = data + 4294967296 end -- Signedness doesn't matter when pushing integer arguments
+    return FormatCached(info[1], data)
+end
+end
+
 --- @param buf       char[]
 --- @param buf_size  int
 --- @param data_type ImGuiDataType
 --- @param data      number
 --- @param format    string
+--- @return int
 function ImGui.DataTypeFormatString(buf, buf_size, data_type, data, format)
-    local str
+    local str = DataTypeFormatStringCached(data_type, data, format)
-    if     data_type == ImGuiDataType.S32 then
+    local len = ImMin(#str, buf_size - 1) -- ImFormatString(): truncate and return the written length
-        str = ImFormatString(format, (ImS32)(data))
+    ImStd.ImStrncpy(buf, 1, { string.byte(str, 1, len) }, 1, len + 1)
-    elseif data_type == ImGuiDataType.U32 then
+    return len
-        str = ImFormatString(format, (ImU32)(data))
-    elseif data_type == ImGuiDataType.Float then
-        str = ImFormatString(format, data)
-    elseif data_type == ImGuiDataType.Double then
-        str = ImFormatString(format, data)
-    elseif data_type == ImGuiDataType.S8 then
-        str = ImFormatString(format, (ImS8)(data))
-    elseif data_type == ImGuiDataType.U8 then
-        str = ImFormatString(format, (ImU8)(data))
-    elseif data_type == ImGuiDataType.S16 then
-        str = ImFormatString(format, (ImS16)(data))
-    elseif data_type == ImGuiDataType.U16 then
-        str = ImFormatString(format, (ImU16)(data))
-    else
-        IM_ASSERT(false)
-    end
-    ImStd.ImStrncpy(buf, 1, { string.byte(str, 1, #str) }, 1, ImMin(#str + 1, buf_size)) -- TODO: update this when new ImFormatString is implemented
 end
 
 --- @param data_type ImGuiDataType
@@ -2431,6 +2470,18 @@ function ImGui.DataTypeApplyOp(data_type, op, arg1, arg2)
         elseif op == 45 then
             return ImSubClampOverflow(arg1, arg2, IM_U32_MIN, IM_U32_MAX)
         end
+    elseif data_type == ImGuiDataType.S64 then
+        if op == 43 then
+            return ImAddClampOverflow(arg1, arg2, IM_S64_MIN, IM_S64_MAX)
+        elseif op == 45 then
+            return ImSubClampOverflow(arg1, arg2, IM_S64_MIN, IM_S64_MAX)
+        end
+    elseif data_type == ImGuiDataType.U64 then
+        if op == 43 then
+            return ImAddClampOverflow(arg1, arg2, IM_U64_MIN, IM_U64_MAX)
+        elseif op == 45 then
+            return ImSubClampOverflow(arg1, arg2, IM_U64_MIN, IM_U64_MAX)
+        end
     elseif data_type == ImGuiDataType.Float then
         if op == 43 then
             return arg1 + arg2
@@ -2534,6 +2585,8 @@ function ImGui.DataTypeCompare(data_type, arg1, arg2)
     elseif data_type == ImGuiDataType.U16 then return DataTypeCompareT((ImU16)(arg1), (ImU16)(arg2))
     elseif data_type == ImGuiDataType.S32 then return DataTypeCompareT((ImS32)(arg1), (ImS32)(arg2))
     elseif data_type == ImGuiDataType.U32 then return DataTypeCompareT((ImU32)(arg1), (ImU32)(arg2))
+    elseif data_type == ImGuiDataType.S64 then return DataTypeCompareT((ImS64)(arg1), (ImS64)(arg2))
+    elseif data_type == ImGuiDataType.U64 then return DataTypeCompareT((ImU64)(arg1), (ImU64)(arg2))
     elseif data_type == ImGuiDataType.Float  then return DataTypeCompareT(arg1, arg2)
     elseif data_type == ImGuiDataType.Double then return DataTypeCompareT(arg1, arg2)
     end
@@ -2564,6 +2617,8 @@ function ImGui.DataTypeClamp(data_type, data, min, max)
     elseif data_type == ImGuiDataType.U16 then return DataTypeClampT((ImU16)(data), min and (ImU16)(min), max and (ImU16)(max))
     elseif data_type == ImGuiDataType.S32 then return DataTypeClampT((ImS32)(data), min and (ImS32)(min), max and (ImS32)(max))
     elseif data_type == ImGuiDataType.U32 then return DataTypeClampT((ImU32)(data), min and (ImU32)(min), max and (ImU32)(max))
+    elseif data_type == ImGuiDataType.S64 then return DataTypeClampT((ImS64)(data), min and (ImS64)(min), max and (ImS64)(max))
+    elseif data_type == ImGuiDataType.U64 then return DataTypeClampT((ImU64)(data), min and (ImU64)(min), max and (ImU64)(max))
     elseif data_type == ImGuiDataType.Float  then return DataTypeClampT(data, min, max)
     elseif data_type == ImGuiDataType.Double then return DataTypeClampT(data, min, max)
     end
@@ -2947,7 +3002,7 @@ function ImGui.InputScalar(label, data_type, data, step, step_fast, format, flag
 
     local data_default = (bit32.band(g.NextItemData.HasFlags, ImGuiNextItemDataFlags.HasRefVal) ~= 0) and g.NextItemData.RefVal or g.DataTypeZeroValue
 
-    local buf, buf_size = {}, 64 -- TODO: IM_COUNTOF()
+    local buf, buf_size = {}, 64 -- char buf[64]; IM_COUNTOF(buf)
     if bit32.band(flags, ImGuiInputTextFlags.DisplayEmptyRefVal) ~= 0 and ImGui.DataTypeCompare(data_type, data, data_default) == 0 then
         buf[1] = 0
     else
@@ -3401,6 +3456,10 @@ function ImGui.DragBehavior(id, data_type, v, v_speed, min, max, format, flags)
         return ImGui.DragBehaviorT(ImS32, ImS32, data_type, v, v_speed, min and min or IM_S32_MIN, max and max or IM_S32_MAX, format, flags)
     elseif data_type == ImGuiDataType.U32 then
         return ImGui.DragBehaviorT(ImU32, ImS32, data_type, v, v_speed, min and min or IM_U32_MIN, max and max or IM_U32_MAX, format, flags)
+    elseif data_type == ImGuiDataType.S64 then
+        return ImGui.DragBehaviorT(ImS64, ImS64, data_type, v, v_speed, min and min or IM_S64_MIN, max and max or IM_S64_MAX, format, flags)
+    elseif data_type == ImGuiDataType.U64 then
+        return ImGui.DragBehaviorT(ImU64, ImS64, data_type, v, v_speed, min and min or IM_U64_MIN, max and max or IM_U64_MAX, format, flags)
     elseif data_type == ImGuiDataType.Float then
         return ImGui.DragBehaviorT(float, float, data_type, v, v_speed, min and min or -FLT_MAX, max and max or FLT_MAX, format, flags)
     elseif data_type == ImGuiDataType.Double then
@@ -3553,10 +3612,19 @@ function ImGui.DragScalar(label, data_type, data, v_speed, min, max, format, fla
         ImGui.MarkItemEdited(id)
     end
 
-    -- TODO: ImGui.DataTypeFormatString() should be used here instead of ImFormatString()
-
     -- Display value using user-provided display format so user can add prefix/suffix/decorations to the value.
-    ImGui.RenderTextClipped(frame_bb.Min, frame_bb.Max, FormatCached(format, data), nil, nil, DRAG_TEXT_ALIGN)
+    local is_mixed = bit32.band(g.LastItemData.ItemFlags, ImGuiItemFlags.MixedValue) ~= 0
+    local value_buf = DataTypeFormatStringCached(data_type, data, (is_mixed and g.MixedValueLabel ~= nil) and g.MixedValueLabel or format)
+    if g.LogEnabled then
+        ImGui.LogSetNextTextDecoration("{", "}")
+    end
+    if is_mixed then
+        ImGui.PushStyleColor(ImGuiCol.Text, g.Style.Colors[ImGuiCol.TextDisabled]) -- ImGuiCol_TextMixedValue
+    end
+    ImGui.RenderTextClipped(frame_bb.Min, frame_bb.Max, value_buf, nil, nil, DRAG_TEXT_ALIGN)
+    if is_mixed then
+        ImGui.PopStyleColor()
+    end
 
     if label_size.x > 0.0 then
         ImGui.RenderText(ImVec2(frame_bb.Max.x + style.ItemInnerSpacing.x, frame_bb.Min.y + style.FramePadding.y), label, 1, label_end, false)
@@ -4127,6 +4195,12 @@ function ImGui.SliderBehavior(bb, id, data_type, v, min, max, format, flags, out
     elseif data_type == ImGuiDataType.U32 then
         IM_ASSERT(max <= math.floor(IM_U32_MAX / 2))
         return ImGui.SliderBehaviorT(ImU32, ImS32, bb, id, data_type, v, min, max, format, flags, out_grab_bb)
+    elseif data_type == ImGuiDataType.S64 then
+        IM_ASSERT(min >= IM_S64_MIN / 2 and max <= IM_S64_MAX / 2)
+        return ImGui.SliderBehaviorT(ImS64, ImS64, bb, id, data_type, v, min, max, format, flags, out_grab_bb)
+    elseif data_type == ImGuiDataType.U64 then
+        IM_ASSERT(max <= IM_U64_MAX / 2)
+        return ImGui.SliderBehaviorT(ImU64, ImS64, bb, id, data_type, v, min, max, format, flags, out_grab_bb)
     elseif data_type == ImGuiDataType.Float then
         IM_ASSERT(min >= -FLT_MAX / 2.0 and max <= FLT_MAX / 2.0)
         return ImGui.SliderBehaviorT(float, float, bb, id, data_type, v, min, max, format, flags, out_grab_bb)
@@ -4239,13 +4313,19 @@ function ImGui.SliderScalar(label, data_type, data, min, max, format, flags)
         window.DrawList:AddRectFilled(grab_bb.Min, grab_bb.Max, ImGui.GetColorU32((g.ActiveId == id) and ImGuiCol.SliderGrabActive or ImGuiCol.SliderGrab), style.GrabRounding)
     end
 
-    -- TODO: ImGui.DataTypeFormatString() should be used here instead of ImFormatString()
-
     -- Display value using user-provided display format so user can add prefix/suffix/decorations to the value.
-    -- if g.LogEnabled then
+    local is_mixed = bit32.band(g.LastItemData.ItemFlags, ImGuiItemFlags.MixedValue) ~= 0
-    --     ImGui.LogSetNextTextDecoration("{", "}")
+    local value_buf = DataTypeFormatStringCached(data_type, data, (is_mixed and g.MixedValueLabel ~= nil) and g.MixedValueLabel or format)
-    -- end
+    if g.LogEnabled then
-    ImGui.RenderTextClipped(frame_bb.Min, frame_bb.Max, FormatCached(format, data), nil, nil, DRAG_TEXT_ALIGN)
+        ImGui.LogSetNextTextDecoration("{", "}")
+    end
+    if is_mixed then
+        ImGui.PushStyleColor(ImGuiCol.Text, g.Style.Colors[ImGuiCol.TextDisabled]) -- ImGuiCol_TextMixedValue
+    end
+    ImGui.RenderTextClipped(frame_bb.Min, frame_bb.Max, value_buf, nil, nil, DRAG_TEXT_ALIGN)
+    if is_mixed then
+        ImGui.PopStyleColor()
+    end
 
     if label_size.x > 0.0 then
         ImGui.RenderText(ImVec2(frame_bb.Max.x + style.ItemInnerSpacing.x, frame_bb.Min.y + style.FramePadding.y), label, 1, label_end, false)
@@ -4461,9 +4541,15 @@ function ImGui.VSliderScalar(label, size, data_type, data, min, max, format, fla
 
     -- Display value using user-provided display format so user can add prefix/suffix/decorations to the value.
     -- For the vertical slider we allow centered text to overlap the frame padding
-    -- local value_buf, value_buf_size = {}, 64
+    local is_mixed = bit32.band(g.LastItemData.ItemFlags, ImGuiItemFlags.MixedValue) ~= 0
-    -- TODO: ImGui.DataTypeFormatString()
+    local value_buf = DataTypeFormatStringCached(data_type, data, (is_mixed and g.MixedValueLabel ~= nil) and g.MixedValueLabel or format)
-    ImGui.RenderTextClipped(ImVec2(frame_bb.Min.x, frame_bb.Min.y + style.FramePadding.y), frame_bb.Max, ImFormatString(format, data), nil, nil, ImVec2(0.5, 0.0))
+    if is_mixed then
+        ImGui.PushStyleColor(ImGuiCol.Text, g.Style.Colors[ImGuiCol.TextDisabled]) -- ImGuiCol_TextMixedValue
+    end
+    ImGui.RenderTextClipped(ImVec2(frame_bb.Min.x, frame_bb.Min.y + style.FramePadding.y), frame_bb.Max, value_buf, nil, nil, ImVec2(0.5, 0.0))
+    if is_mixed then
+        ImGui.PopStyleColor()
+    end
     if label_size.x > 0.0 then
         ImGui.RenderText(ImVec2(frame_bb.Max.x + style.ItemInnerSpacing.x, frame_bb.Min.y + style.FramePadding.y), label, 1, label_end, false)
     end
@@ -6350,6 +6436,12 @@ function ImGui.InputTextEx(label, hint, buf, buf_size, size_arg, flags, callback
         state.TextSrc = nil
     end
 
+    -- Log as text
+    if g.LogEnabled and (not is_password or is_displaying_hint) then
+        ImGui.LogSetNextTextDecoration("{", "}")
+        ImGui.LogRenderedText(draw_pos, ImGui._ByteArrayToString(buf_display, 1, buf_display_end))
+    end
+
     if label_size.x > 0.0 then
         ImGui.RenderText(ImVec2(frame_bb.Max.x + style.ItemInnerSpacing.x, frame_bb.Min.y + style.FramePadding.y), label, 1, label_end, false)
     end
@@ -7968,9 +8060,9 @@ function ImGui.TreeNodeBehavior(id, flags, label, label_end)
             if bit32.band(flags, ImGuiTreeNodeFlags.ClipLabelForTrailingButton) ~= 0 then
                 frame_bb.Max.x = frame_bb.Max.x - (g.FontSize + style.FramePadding.x)
             end
-            -- if g.LogEnabled then
+            if g.LogEnabled then
-            --     ImGui.LogSetNextTextDecoration("###", "###")
+                ImGui.LogSetNextTextDecoration("###", "###")
-            -- end
+            end
         else
             -- Unframed typed for tree nodes
             if hovered or selected then
@@ -7986,9 +8078,9 @@ function ImGui.TreeNodeBehavior(id, flags, label, label_end)
             elseif not is_leaf then
                 ImGui.RenderArrow(window.DrawList, ImVec2(text_pos.x - text_offset_x + padding_x, text_pos.y + g.FontSize * 0.15), text_col, is_open and ((bit32.band(flags, ImGuiTreeNodeFlags.UpsideDownArrow) ~= 0) and ImGuiDir.Up or ImGuiDir.Down) or ImGuiDir.Right, 0.70)
             end
-            -- if g.LogEnabled then
+            if g.LogEnabled then
-            --     ImGui.LogSetNextTextDecoration(">", nil)
+                ImGui.LogSetNextTextDecoration(">", nil)
-            -- end
+            end
         end
 
         if draw_tree_lines then
@@ -10447,7 +10539,7 @@ function ImGui.BeginMenuEx(label, icon, enabled)
         ImGui.PushStyleVarX(ImGuiStyleVar.ItemSpacing, style.ItemSpacing.x * 2.0)
         local text_pos = ImVec2(window.DC.CursorPos.x + offsets.OffsetLabel, pos.y + window.DC.CurrLineTextBaseOffset)
         pressed = ImGui.Selectable("", menu_is_open, selectable_flags, label_size)
-        -- TODO: ImGui.LogSetNextTextDecoration("[", "]")
+        ImGui.LogSetNextTextDecoration("[", "]")
         ImGui.RenderText(text_pos, label, 1, label_end, false)
         ImGui.PopStyleVar()
         window.DC.CursorPos.x = window.DC.CursorPos.x + IM_TRUNC(style.ItemSpacing.x * (-1.0 + 0.5)) -- -1 spacing to compensate the spacing added when Selectable() did a SameLine(). It would also work to call SameLine() ourselves after the PopStyleVar().
@@ -10463,7 +10555,7 @@ function ImGui.BeginMenuEx(label, icon, enabled)
         local extra_w = ImMax(0.0, ImGui.GetContentRegionAvail().x - min_w)
         local text_pos = ImVec2(window.DC.CursorPos.x, pos.y + window.DC.CurrLineTextBaseOffset)
         pressed = ImGui.Selectable("", menu_is_open, bit32.bor(selectable_flags, ImGuiSelectableFlags.SpanAvailWidth), ImVec2(min_w, label_size.y))
-        -- ImGui.LogSetNextTextDecoration("", ">")
+        ImGui.LogSetNextTextDecoration("", ">")
         ImGui.RenderText(ImVec2(text_pos.x + offsets.OffsetLabel, text_pos.y), label, 1, label_end, false)
         if icon_w > 0.0 then
             --- @cast icon string
@@ -10713,7 +10805,7 @@ function ImGui.MenuItemEx(label, icon, shortcut, selected, enabled)
             end
             if shortcut_w > 0.0 then
                 ImGui.PushStyleColor(ImGuiCol.Text, style.Colors[ImGuiCol.TextDisabled])
-                -- ImGui.LogSetNextTextDecoration("(", ")")
+                ImGui.LogSetNextTextDecoration("(", ")")
                 --- @cast shortcut string
                 ImGui.RenderText(text_pos + ImVec2(offsets.OffsetShortcut + stretch_w, 0.0), shortcut, nil, nil, false)
                 ImGui.PopStyleColor()

imstd_minstdio.lua

@@ -3,7 +3,8 @@
 
 -- Supports:
 -- - %x, %X, %nx, %nX (where n is a number)
--- - %d, %nd (where n is a number)
+-- - %d, %nd, %u, %nu (where n is a number)
+-- - length modifiers h, hh, l, ll, I64 on integers: ll/I64 = 64-bit range (doubles: exact only within +-2^53)
 -- - %f, %lf (very limited)
 --
 -- Returns items_matched instead of EOF on error
@@ -17,6 +18,9 @@ local CHAR_0, CHAR_9 = _byte'0', _byte'9'
 local CHAR_a, CHAR_A = _byte'a', _byte'A'
 local CHAR_d = _byte'd'
 local CHAR_l = _byte'l'
+local CHAR_h = _byte'h'
+local CHAR_u = _byte'u'
+local CHAR_I = _byte'I'
 local CHAR_f, CHAR_F = _byte'f', _byte'F'
 local CHAR_x, CHAR_X = _byte'x', _byte'X'
 
@@ -37,10 +41,15 @@ local function hex_digit_to_int(c)
 end
 
 -- we force this behavior by default
-local function clamp_if_overflow(spec, val)
+local function clamp_if_overflow(spec, val, is_64)
     if spec == CHAR_d or spec == CHAR_x or spec == CHAR_X then
-        if val > INT_MAX then return INT_MAX end
+        local max = is_64 and 9223372036854775807 or INT_MAX
-        if val < INT_MIN then return INT_MIN end
+        local min = is_64 and -9223372036854775808 or INT_MIN
+        if val > max then return max end
+        if val < min then return min end
+    elseif spec == CHAR_u then
+        local max = is_64 and 18446744073709551615 or UINT_MAX
+        if val > max then return max end
     end
 
     return val
@@ -104,22 +113,27 @@ local function sscanf(buffer, buffer_begin, format, result)
             width = math.huge
         end
 
+        -- length modifiers
+        local n_l = 0
+        while _byte(format, f, f) == CHAR_l or _byte(format, f, f) == CHAR_h do
+            if _byte(format, f, f) == CHAR_l then n_l = n_l + 1 end
+            f = f + 1
+        end
+        if _byte(format, f, f) == CHAR_I and string.sub(format, f, f + 2) == "I64" then
+            n_l = 2
+            f = f + 3
+        end
+        local is_64 = n_l >= 2
+
         local spec = _byte(format, f, f)
         local base
         local is_float = false
         if     spec == CHAR_x or spec == CHAR_X then
             base = 16
-        elseif spec == CHAR_d then
+        elseif spec == CHAR_d or spec == CHAR_u then
             base = 10
         elseif spec == CHAR_f or spec == CHAR_F then
-            is_float = true
+            is_float = true -- TODO: distinguish %lf from %f?
-        elseif spec == CHAR_l then
-            f = f + 1
-            if _byte(format, f, f) == CHAR_f then
-                is_float = true -- TODO: distinguish from float?
-            else
-                return items_matched
-            end
         else
             return items_matched
         end
@@ -197,11 +211,14 @@ local function sscanf(buffer, buffer_begin, format, result)
                 val = val * base + sign * hex_digit_to_int(c)
 
                 local old_val = val
-                val = clamp_if_overflow(spec, val)
+                val = clamp_if_overflow(spec, val, is_64)
                 if old_val ~= val then
                     break
                 end
             end
+            if spec == CHAR_u and val < 0 then
+                val = val + (is_64 and 18446744073709551616 or 4294967296) -- unsigned wrap-around like strtoul()
+            end
         end
 
         result[assigned + 1] = val

tools/test/check_all.sh

@@ -14,7 +14,7 @@ CHECKS=(
 "cached|CACHED OK|$R --main tools/test/scripts/t_cached_window.luau --frames 130"
 "fixes|FIXES OK|$R --main tools/test/scripts/t_fixes.luau --frames 55"
 "debugtools|DEBUGTOOLS OK|$R --main tools/test/scripts/t_debugtools.luau --frames 65"
-"helpers|HELPERS OK|$R --main tools/test/scripts/t_helpers.luau --frames 35"
+"helpers|HELPERS OK|$R --main tools/test/scripts/t_helpers.luau --frames 45"
 "multiselect|MULTISELECT OK|$R --main tools/test/scripts/t_multiselect.luau --frames 380"
 "nodemo|NODEMO OK|NO_DEMO=1 $R --main tools/test/scripts/t_nodemo.luau --frames 25"
 "widgets|OK|$R --main tools/test/scripts/t_widgets.luau --frames 80"

tools/test/love/run.sh

@@ -4,4 +4,4 @@ set -e
 cd "$(dirname "$0")/../../.."
 python3 tools/bundle.py --target love >/dev/null
 nix-shell -p luajit --run "luajit tools/test/love/t_drawhash.lua 150 Widgets,Basic && luajit tools/test/love/t_drawhash.lua 150 all && luajit tools/test/love/t_examples.lua"
-echo "expected (Luau, tools/test/scripts/t_drawhash.luau): 154977593 / 338324359"
+echo "expected (Luau, tools/test/scripts/t_drawhash.luau): 154977593 / 263656315"

tools/test/scripts/t_helpers.luau

@@ -1,5 +1,6 @@
 -- Small upstream helpers: ImGuiInputTextState selection API + ReloadUserBuf*, ImGuiInputTextCallbackData:SetSelection, ImDrawList AddImageQuad/PrimQuadUV/
--- CloneOutput, ImDrawData DeIndexAllBuffers/ScaleClipRects, ImBitVector/ImBitArray*, ImGuiPackedDate, ImParseFormatSanitizeForPrinting, drag cancel (ShortcutsForCancel)
+-- CloneOutput, ImDrawData DeIndexAllBuffers/ScaleClipRects, ImBitVector/ImBitArray*, ImGuiPackedDate, ImParseFormatSanitizeForPrinting, drag cancel (ShortcutsForCancel),
+-- log decorations, ImGuiDataType.S64/U64, BringWindowToDisplayBehind, ImGuiSizeCallbackData
 local G = require(game:GetService("ReplicatedStorage"):WaitForChild("ImGui"))
 local ImGui, ImVec2 = G.ImGui, G.ImVec2
 ImGui.CreateContext(); G.ImGui_ImplRoblox.Init()
@@ -40,6 +41,7 @@ local function cb(data)
     return 0
 end
 local df, rect_df = 10.0, nil
+local s64_v = 2 ^ 40
 local f = 0
 local function center(r) return (r[1].x + r[2].x) / 2, (r[1].y + r[2].y) / 2 end
 
@@ -218,8 +220,82 @@ game:GetService("RunService").Stepped:Connect(function()
         check(not string.find(ImGui.SaveIniSettingsToMemory(), "LastUsed", 1, true), "ConfigIniSettingsSaveLastUsedDate = false")
         io.ConfigIniSettingsSaveLastUsedDate = true
         pio.Platform_SessionDate = 0
+
+        -- Log decorations: Selectable/Button/Checkbox/MenuItem shortcut
+        ImGui.LogToBuffer()
+        ImGui.Selectable("sel item")
+        ImGui.Button("btn")
+        ImGui.Checkbox("chk", true)
+        ImGui.MenuItem("mi", "Ctrl+M")
+        local log = g.LogBuffer:c_str()
+        ImGui.LogFinish()
+        check(string.find(log, "[sel item]", 1, true) == nil and string.find(log, "sel item", 1, true) ~= nil, "Selectable logs plain label: " .. log)
+        check(string.find(log, "[ btn ]", 1, true) ~= nil and string.find(log, "[x]", 1, true) ~= nil and string.find(log, "mi ( Ctrl+M )", 1, true) ~= nil, "LogSetNextTextDecoration [ ]: " .. log)
+
+        -- DragScalar S64/U64 (doubles) + DataTypeFormatString
+        local v64, ch = ImGui.DragScalar("##s64", G.ImGuiDataType.S64, 2 ^ 40, 1.0)
+        check(v64 == 2 ^ 40 and ch == false, "DragScalar S64 idle")
+        local b64 = {}
+        local n = ImGui.DataTypeFormatString(b64, 64, G.ImGuiDataType.S64, -(2 ^ 40), "%lld")
+        check(G.ImGui._ByteArrayToString(b64, 1, n + 1) == "-1099511627776", "DataTypeFormatString S64")
+        n = ImGui.DataTypeFormatString(b64, 64, G.ImGuiDataType.U64, 18446744073709551615, "%llu")
+        check(G.ImGui._ByteArrayToString(b64, 1, n + 1) == "18446744073709551615", "DataTypeFormatString U64 max")
+        n = ImGui.DataTypeFormatString(b64, 64, G.ImGuiDataType.S32, -5, "%X")
+        check(G.ImGui._ByteArrayToString(b64, 1, n + 1) == "FFFFFFFB", "DataTypeFormatString S32 hex")
+        local tb = ImGui.NewTextBuffer("-123456789012", 64)
+        local r64, c64 = ImGui.DataTypeApplyFromText(tb, G.ImGuiDataType.S64, 0, "%lld")
+        check(r64 == -123456789012 and c64, "DataTypeApplyFromText S64 " .. tostring(r64))
+        check(ImGui.DataTypeApplyOp(G.ImGuiDataType.S64, 43, 2 ^ 62, 2 ^ 62) == 9223372036854775807, "DataTypeApplyOp S64 clamp")
+        check(G.ImGuiDataType.Float == 8 and G.ImGuiDataType.COUNT == 12 and ImGui.DataTypeGetInfo(G.ImGuiDataType.Float).Name == "float", "ImGuiDataType layout")
     end
+    -- DragScalar S64: drag with the mouse
+    local s64_rect
+    s64_v = ImGui.DragScalar("##drag_s64", G.ImGuiDataType.S64, s64_v, 1.0)
+    do local a, b = ImGui.GetItemRectMin(), ImGui.GetItemRectMax(); s64_rect = { ImVec2(a.x, a.y), ImVec2(b.x, b.y) } end
+    if f == 33 then io:AddMousePosEvent(center(s64_rect)) end
+    if f == 34 then io:AddMouseButtonEvent(0, true) end
+    if f == 35 then local x, y = center(s64_rect); io:AddMousePosEvent(x + 30, y) end
+    if f == 37 then io:AddMouseButtonEvent(0, false); check(s64_v > 2 ^ 40 and s64_v == math.floor(s64_v), "DragScalar S64 drag " .. s64_v) end
     ImGui.End()
+
+    -- BringWindowToDisplayBehind
+    if f == 38 then
+        local g = ImGui.GetCurrentContext()
+        local wa, wb, wc = ImGui.FindWindowByName("WA"), ImGui.FindWindowByName("WB"), ImGui.FindWindowByName("WC")
+        local function idx(w) return ImGui.FindWindowDisplayIndex(w) end
+        ImGui.BringWindowToDisplayFront(wa); ImGui.BringWindowToDisplayFront(wb); ImGui.BringWindowToDisplayFront(wc)
+        local n0 = g.Windows.Size
+        ImGui.BringWindowToDisplayBehind(wc, wa) -- move forward-placed window behind: WC WA WB
+        check(idx(wc) + 1 == idx(wa) and idx(wa) + 1 == idx(wb) and g.Windows.Size == n0, ("BringWindowToDisplayBehind back %d %d %d"):format(idx(wa), idx(wb), idx(wc)))
+        ImGui.BringWindowToDisplayBehind(wa, wb) -- already directly behind: unchanged
+        check(idx(wc) + 1 == idx(wa) and idx(wa) + 1 == idx(wb), "BringWindowToDisplayBehind no-op")
+        ImGui.BringWindowToDisplayBehind(wc, wb) -- WA WC WB
+        check(idx(wa) + 1 == idx(wc) and idx(wc) + 1 == idx(wb) and g.Windows.Size == n0, ("BringWindowToDisplayBehind fwd %d %d %d"):format(idx(wa), idx(wb), idx(wc)))
+    end
+    for _, name in { "WA", "WB", "WC" } do
+        ImGui.SetNextWindowPos(ImVec2(820, 10)); ImGui.SetNextWindowSize(ImVec2(80, 60))
+        ImGui.Begin(name); ImGui.End()
+    end
+
+    -- Size callback (Step + AspectRatio)
+    ImGui.SetNextWindowPos(ImVec2(10, 420))
+    if f <= 3 then ImGui.SetNextWindowSize(ImVec2(237, 160)) end
+    ImGui.SetNextWindowSizeConstraints(ImVec2(0, 0), ImVec2(G.FLT_MAX, G.FLT_MAX), function(data)
+        local step = data.UserData
+        check(data.Pos ~= nil and data.CurrentSize ~= nil and not rawequal(data.DesiredSize, data.CurrentSize), "ImGuiSizeCallbackData fields")
+        data.DesiredSize = ImVec2(math.floor(data.DesiredSize.x / step + 0.5) * step, math.floor(data.DesiredSize.y / step + 0.5) * step)
+    end, 100.0)
+    ImGui.Begin("Step"); local step_size = ImGui.GetWindowSize(); ImGui.End()
+    ImGui.SetNextWindowPos(ImVec2(300, 420))
+    if f <= 3 then ImGui.SetNextWindowSize(ImVec2(320, 100)) end
+    ImGui.SetNextWindowSizeConstraints(ImVec2(0, 0), ImVec2(G.FLT_MAX, G.FLT_MAX), function(data)
+        data.DesiredSize.y = math.floor(data.DesiredSize.x / data.UserData)
+    end, 16 / 9)
+    ImGui.Begin("Aspect"); local asp_size = ImGui.GetWindowSize(); ImGui.End()
+    if f == 5 then
+        check(step_size.x == 200 and step_size.y == 200, ("size callback Step %gx%g"):format(step_size.x, step_size.y))
+        check(asp_size.x == 320 and asp_size.y == 180, ("size callback AspectRatio %gx%g"):format(asp_size.x, asp_size.y))
+    end
     ImGui.Render(); G.ImGui_ImplRoblox.RenderDrawData(ImGui.GetDrawData())
-    if f == 32 and #failed == 0 then print("HELPERS OK") end
+    if f == 40 and #failed == 0 then print("HELPERS OK") end
 end)